exploring_redox.md: Update to reflect virtual terminal changes (#59)

It looks like virtual terminal usage has changed, so I updated this page. Feel free to correct me if I'm wrong.

src/getting_started/exploring_redox.md

 Exploring Redox
 ===============
 
-To launch Redox's graphical interface launch `orbital` from the commandline.
+Use F2 or F3 keys to get to a login shell. User `user` can login without password. For `root`, the password is `password` for now. `help` lists builtin commands for your shell (ion). `ls /bin` will show a list of applications you can execute.
 
-```sh
-$ orbital
-```
+Use F4 key to switch to a graphical user interface (orbital). Log in with the same username/password combinations as above.
 
-This should put you into the orbital GUI if you got into a terminal by running
-`make qemu` or `make virtualbox`.
+Use the F1 key to get back to kernel output.
 
 Sodium
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